Stop motion apparatus for wrapping machines



Feb. 9, 1954 J. C. BAREFOOT STOP MOTION APPARATUS FOR WRAPPING MACHINES Filed June 1, 1949 8Sheets-Sheet l INVENTOR flare/00i- BY flflA/ZXJW HTTORNE) v2 wi Feb. 9, 1954 BAREFOQT I 2,668,404

STOP MOTION APPARATUS FOR WRAPPING MACHINES Filed June 1, 1949 8 Sheets-Sheet 2 Feb. 9, 1954 J. C. BAREFOOT STOP MOTION APPARATUS FOR WRAPPING MACHINES Filed June 1, 1949 8 Sheets-Sheet 3 INVENTOR. Jude [7' Bare/"0 HTTOR/ Feb. 9, 1954 J. c. BAREFOOT STOP MOTION APPARATUS FOR WRAPPING MACHINES Filed June 1', 1949 8 Sheets-Sheet 4 HTTORNEY Feb. 9, 1954 .1. c. BAREFOOT STOP MOTION APPARATUS FOR WRAPPING MACHINES 8 Sheets-Sheet 5 Filed June 1 1949 INVENTOR. Jba'e flare/00f Feb. 9, 1954 .1. c. BAREFOOT 2,668,404

STOP MOTION APPARATUS FOR WRAPPING MACHINES Filed June 1, 1949 8 Sheets-Sheet 6 INVENTOR.

Jade flare/ I BY ll 77' ORNE I Feb. 9, 1954 J. c. BAREFOOT STOP MOTION APPARATUS FOR WRAPPING MACHINES 8 Sheets-Sheet 7 INVENTOR. Jade a. flare/00f By ,c TTOR/VEY 6. M 6 i 5 74W M a 1 2 m a m M M a M w A A 4 I l 5 4 7 I] M m .6/ dl M 2 m J 8 5 d 7 5 3 x a w a.

L \\\& H) z g? Feb. 9, 1954 J. c. BAREFOOT STOP MOTION APPARATUS FOR WRAPPING MACHINES 8 Sheets-Sheet 8 Filed June 1, 1949 ,qTTORNEY Patented Feb. 9, 1954 STOPMGTION APPARATUS FOR WRAPPING MACHINE S J ocie C. Barefoot, Charlotte, N. (5. Application June 1, 1949, Serial No. 96,505

' Claims.

This invention relates to a machine for wraD- ping cakes, cookies and the like, and. more specifi cally it relates to an improved automatic stop motion apparatus for such machines.

The present inventionis particularly concerned with a control system for-that. type of wrapping machine which has a driven feed conveyor. onto which cakes or the like are adapted to' be placed for delivery to a wrapping station.- at which a wrapping sheet is presented; In such machines the cakes are automatically removed from the conveyor by a transfer device which moves the cake into engagement with a sheet of wrapping material, such as cellophane, which is automatically fed in. sheets of predetermined size to a wrapping station above the path ofv the feed conveyor. Means are provided. in such machines for further folding the wrapping. sheet about the cake and for then feeding the package into contact with heated surfaces which'seal. the wrapping material to form a closed package. The wrapped cakes or the like are then delivered from. the machine ready for further packaging and, distribution.

Although it is to be understoodithat the present invention may be applied with equal ease to many other types of machines, the present invention is shown as being applied to a machine of the type manufacture t by Battle Creek: Bread: Wrapping Machine Company, Battle Creek,Michigan, known as their Model 34 machine.

Heretoioremachines of this general type have been. provided with stop motion mechanism efiecti-veto stop the feed of. wrapping material. in the event a cake is not positioned. on the feed con.- veyor for trans-fer into engagement with. a lower surface of av wrapping sheet at the wrapping Sta-- tion. Such controls have prevented the delivery of unneeded wrapping material to: the'wrapping station.

However, in knowncontrolsystems; a cake presented at the wrapping station in absence of wrapping material may be raised by the transfer means and will thereby be passed through the machinewithout being wrapped. It is manifest that this results in the various parts of the machine becoming. coated; with filling material or frosting.- which is usually on: cakesof this type, and cakes; so deliveredare also broken into. small pieces as they pass through the wrapping mechanism. necessitates that damaged and broken cakes be removed from the machine and be thrown away,. and it also requires. that. the machine be stopped and. cleaned; before further operation.

It is, therefore, an object of this invention to provide automatic means for immediately stopping the machine in the event a sheet of cake wrapping material is not disposed above thecake transfer device, although" the cake may be positioned on the conveyor for engagement by such device.

It is another object of this invention to: provide automatic stop motion means for'cake wrapping machines of the typedescribed: which will: be rendered operative for stopping the: machine upon absence of a sheet of wrapping material at the wrapping station above the elevatingmeansg. although the elevating means may engage a. cake or the like on the conveyor.

It is a further object to provide means whereby the cake elevating mechanism may continue to operate for a predetermined length 01. time for elevating the cake to a position above. the point at which it normally engages the wrapping ma;- terial and to thereby position the cake Whereit will be accessible for removal after the machine has stopped,

It is still another object of this invention. to provide a brake mechanism adapted to cooperate with the stopmotion apparatus; which. is automatically renderedoperable in timed rela tion to the cake conveying apparatus and e'levating means upon failure in delivery of a piece of wrapping material in the wrapping station above the elevating means, and to thus stop the machine when the elevating means is at its maximum elevation, thereby enabling anoperator'to remove the cake from the machine with the least possible inconvenience.

Some of the objects of the invention havebeen stated. hereinabove, but other objects will appear as the description is read in connection with the accompanying drawings in which:

Figure 1 is a plan view of the cake wrapping machine showing the control system applied thereto;

Fig. 2 is a vertical. sectional view through the cake wrapping machine taken on line 2-4 of. Fig. 1;

Fig. 3 is an enlarged. elevational view on line. 5-3. of Fig. 1, some parts being shown in section and others in full line;

Figure 4 is an enlarged fragmentary elevational view on line l4 of Fig. 1 with some parts thereof in section and other parts thereof omitted;

Fig. 5 is an elevational view on line H of Fig. 4; showing apart of the stopmotiOn-mechanlsm;

Fig. 6 is a vertical sectional view on line 6-6 of Fig. 4, showing the brake mechanism;

Fig. 7 is a view similar to Fig. 6 but shows the parts in a displaced position relative thereto;

Fig. 8 is an enlarged sectional view taken on line 8-8 of Fig. 1, and shows the web cuttin and sheet delivery mechanism;

Fig. 9 is a more or less schematic view generally along line 9-9 of Fig. 8, showing a power transmission control device;

Fig. 10 is an elevational view taken on line |6|0 of Fig. l, omitting the folding and ejecting mechanism relative to the wrapping station and showing part of the improved stop mechanism as applied to the wrapping machine;

Fig. 11 is an enlarged vertical sectional view through a vacuum switch taken on line I l--I l of Fig. 10

Fig. 12 is an enlarged schematic vertical sectional view taken on line |2-l2 of Fig. 8, showing part of the wrapping station;

Fig. 13 is an enlarged vertical sectional view taken on line 23-13 of Fig. 3, showing a time delay relay mechanism adapted for use in the control system;

Fig. 14 is an enlarged elevational view taken on line l4l4 of Fig. 5, showing a clutch releasing mechanism which is responsive to the improved stop motion mechanism herein;

Fig. 15 is a vertical sectional view on line l-I 5 of Fig. 4, showing the brake mechanism and also showing power transmission clutch mechanism;

Fig. 16 is an enlarged vertical sectional view taken on line l6l6 of Fig. and

Fig. 1'1 is a schematic diagram showing electrically and pneumatically operated devices comprising the improved stop motion system.

The wrapping machine frame l0 comprises side frame members II and 12 which are joined together at one end by cross frame members I3 and I4 and at the other end by cross frame members and I6. For the purpose of this description, the left hand or feed end of the machine, as viewed in Figs. 1 and 2, will hereinafter be referred to as the front of the machine, while the right hand or discharge end of the machine as viewed in the same figures will be referred to as the rear of the machine.

Conveyor frame members 26 and 2| are suitably secured at one end to the cross frame member 16 and at the opposite end they are supported on suitable stands 23, only one of which is illustrated in Fig. 2. The side frame members H and I2 and the conveyor stands 23 are adapted for support on any suitable base such as a floor. Means for feeding and cutting a web of wrapping material is supported on spaced frame members 25 and 26 which are suitably secured to the side frame member H of the machine chassis.

The machine is adapted to be driven by an electric motor 30 (Fig. 10-) which by its leads 3| and 32 is adapted for inclusion in a control system which is to be described more particularly hereinafter. The electric motor 30 is suitably secured to a motor bracket 33, the bracket being secured as by screws 34 to the cross frame member IS. The motor has a driven pulley 35 thereon on which is mounted a wide V-belt 36. The V-belt 36 extends to an idler pulley 31 (Fig. 4) mounted for rotation on a drive shaft 46. The pulley 31 has a dog clutch member 42 formed integrally therewith (Fig. 15) which is adapted to engage a mating dog clutch member 43 splined on the drive shaft by means of splines 44 for 4 limited longitudinal sliding movement on the drive shaft 46.

The dog clutch member 43 has an annular groove 45 therein which is adapted for engagement with one end of a yoke member 46 which is fixed at its other end on a shipper shaft 56. The drive shaft 46 is journaled for rotation in the side frame members II and i2, and the shipper shaft 56 is mounted for longitudinal sliding movement in the side frame members II and 12. Means has been provided herein for automatically operating the shipper shaft 50 for disengaging the dog clutch members 42 and 43, and since this mechanism is an important part of the present invention, it will be described in greater detail at a later point herein.

The drive shaft 40 extends beyond the side frame member I i (Fig. 15) and has fixed thereto a, hand wheel 5!. The other end of the drive shaft 40 extends beyond the opposite side frame member i2 and has another hand wheel 52 (Fig. 10) fixed to the end thereof. A pinion 53 is mounted on the drive shaft 40 for rotation therewith at a point intermediate its ends (Fig. 2). The pinion 52 meshes with a gear 54 which is keyed to a cam shaft 55, the latter being journaled for rotation in the side frame members H and I2.

A miter gear 56 fixed to shaft 55 adjacent the side frame member ll (Fig. 10) meshes with a miter gear 51 fixed to one end of a forwardly and rearwardly extending shaft 60. The shaft 60 is mounted for rotation in suitable bearings 61 which are secured to the side frame member I l. The opposite end of the shaft 66 likewise has a miter gear 62 fixed thereto, and this miter gear meshes with a second miter gear 63 fixed to a cam shaft 65, which in turn is journaled for rotation in the side frame members II and 12.

By reference to Fig. 2 it may be observed that the cam shaft 65 has a sprocket wheel 66 keyed thereto, and that the sprocket wheel 66 engages a sprocket chain 61. The sprocket chain 61 is in driving engagement with a sprocket wheel 16 which is keyed to an idler shaft 1| journaled for rotation in the side frame members i l and 12. The shaft 1i has a plurality of sprocket wheels 12 keyed thereto, only one of which is shown in Fig. 2. The sprocket wheels 12 are spaced from each other and support sprocket chains 13-16, inclusive. Portions of the sprocket chains 13-16, inclusive, are shown at the feed end of the machine in Fig. 1. The sprocket conveyor chains 13 and 14 are also shown in Fig. 2. The sprocket conveyor chains 15 and 16 are mounted in the same manner as the sprocket conveyor chains 13 and 14, respectively, therefore, a consideration of the mounting of the sprocket chain 14 as shown in Fig. 2 will indicate the manner in which the remaining chains of this series are mounted. The chain 14 extends downwardly from the sprocket wheel 1! and passes under an idler sprocket wheel from which point it assumes a generally horizontal course where it passes beneath another idler sprocket wheel 8 l. The idler sprocket wheels 86 and BI are keyed to transverse shafts 62 and 83 respectively, both of which are rotatably journaled in the side frame members i i and !2. It will be noted that the conveyor sprocket chain 14 extends upwardly from the sprocket wheel 81 is a substantially vertical plane and passes over an idler-sprocket wheel 65, the idler sprocket wheel 85 being keyed to a transverse shaft 86, which is journaled for free rotation in the conveyor frame members 20 and 2+. The conveyor chain I3 assumes a-somewhat rearwardly inclined upward course and extends about an idler sprocket wheel 87 located somewhat to the rear of the idler sprocket- 85. The sprocket conveyor chains 13' and F4 are trained beneath and around a pair of sprocket wheels-9D" and 91; which are keyed to a transverse shaft 92, the latter being iournal'ed for rotation in the conveyor frame members 2t and 2%. The upper reaches of the conveyor chains Ii3"-I5, inclusive; then extend to the first describedset of sprocket Wheels T2;

A plurality of. alternately spaced angle bars 93 extend between andare connected" to the sprocket" conveyor chains. I3 and it. angle bars 513' is anangle bar 9.4 which has its.

opposite ends connected to the sprocket chains.

T4 and I5 and, as is conventional in" wrapping machines of. this kind,.the shafts 88v and 88 are so mounted that they may be. adjusted; relative to each other in order to increase or decrease the distance between the complementary sets of angle bars 93 and 94110 accommodate articles of. various sizes.

It may be observed in Figs. 1. andv 2 that there is' a pair of'sprocket wheels lilil keyed to the shaft. 92' and these sprocket wheels are spaced from. eachother and accommodate conveyor sprocket chains MN. The remote bight. of the. conveyor sprocket chain flights engage sprocket wheels, IIlZI which are. mounted for rotation on. a stub shatt IM carried by the machine frameat a point between the conveyor frame. members. 20" and H. The conveyor sprocket. chains lill areeach pro.-

Between each. of the.

vided with a plurality of equally spaced guide plates II 6, which are effective to prevent endwise. movement of the cake or other article disposed on the angle bars 93 and 9'4. It. willi'be. noted in Fig. 2 that each of the cakes or. similar. articles C is preferably mounted on a suitably; shaped. pallet D. of cardboard or other suitable material; ,These supporting pallets are. usually included; in the cake package and contribute to the successful. operation of the wrapping machine" It mayv be. perceived therefore, how the. conveyor comprising conveyor chains 13-15, inclusive, and: ii is constantly driven. Arranged to move in timed relation to the movement of the conveyor chains is an elevating member H5 which is shown in its raised position in Fig, 2. andv which is mounted for oscillating movement.

between its: raised and lowered position by means of connections. II 6 and II? to operating arms Hi8 and H9; respectively. The arm H9 is fixed to a shaft I22 which is. adapted to rock in suitable brackets secured to the side frame members H and it. The arm H8 is connected. for pivotal movement to an arm l23'which is fixed to a trans.- verseshaft i2 5, the latter being mounted for rockingmovement in the side frame members It and i2; It will be noted by reference. to Fig. 2 that the shaft 224- has'a cam following arm I25 fixed to its outer end. The cam foll'owing'arm is. adapted to ride at itsxfree. end in a face cam I?! having an irregular groove I28 therein for transmitting oscillating motion to the shaft. 124 and thus to the elevating arm H5. The elevating arm H5 has a plate I30 at its upper end; which is adapted to engage the lowerf'ace ofthe pallet members D upon which the cakes. C rest as they pass. above the elevating arm while disposed on the conveyor angle members 93' and" M. It will follow; therefore, that when in. such position, oscillation of the elevating arm linkage will transfer'the cake C to the raised'position as shown in Fig; 2' and which position may be. referred to as the wrapping station.

In its upward movement, the upper portion of the elevating arm I I5 passes between horizontally disposed plates I32 and It? (Figs. 1. and 2) which slidably support the upper reaches of conveyor belts I34 and I35, respectively. The conveyor belts I3 and I are. designed to carry sheets of wrapping material Wfrom the point at which they are cut from a web to the wrapping station, all as will be described in greater detail hereinafter. The plates I32 and I 33are suitably secured at. opposite ends thereof to the side frame mem bers II and I2.

The conveyor belts I34 and I35 are mounted in an identical manner and. by referring to Fig. 8'

it may be observed that" the right hand portion of the conveyor belt I35 passes through the plate I33. and is mounted on an idler roll lit. The left hand portion of belt is mounted on a roller I31 fixed to a shaft I which is journaled for rotation in bearing, blocks M l. The shaft I!!! has a sprocket Wheel ['42 keyed." to one end thereof. A sprocket chain sprocket wheel I421 with a sprocket wheel. I13 keyed to: the forwardly and. rearwardly extending shaft 69 hereinabove described.

As best seen in Figs. 3,, 8 and 9, the shaft. fiii also has a sprocket wheel [41 free thereon, and

forming a partof the sprocket wheel I l? or being attached thereto is a clutch plate lat. on which a clutch pawl ['51. is mounted for rocking movement about a stud [52. A tension spring I53 normally urges the clutch pawl I51 into engagement with a tooth I56, projecting from the periphery of a cam wheel [55. The cam wheel I 55 is keyed to the shaft iii and it follows, therefore; that. when the clutchpawlv I5! is in engagement with the projection [5% of the cam wheel I55, rotation will be transmitted to the. sprocket wheel I4! and from. the. sprocket wheel it? through the sprocket chain ltd, the upper bight of which. is in driving. contact with a sprocket wheel ISI for driving the web cutting mechanism and the sheet. feeding means.

Reference to Figs. 2.' and 9. will disclose a finger I53 which is normally urged upwardly into the path of the cake conveyor about a. fixed pivot I 63a. by a weight arm I64 However, as cakes pass over the finger It3',. the finger is depressed in a clockwise directionas viewed in 9, and this movement is. effective to impart right to left movementvto an. arm I55. The arm. 65 has aflock segment TEST pivotally connected thereto, and. this segment in turn is. mounted for rocking movement about a pivot point It? on a. bracket l'ftl'suitahly secured to theside frame member H.

The locking, segment i6 is adapted to normally engage the. upper surface of. an annular shoulder I'TI' formed'inflthe body of. a vertically movable plunger IJIZ (Pig). 9-). The plunger H2 is mounted for free vertical sliding movement in the bracket Il'lifi.. its lower and rides in corn tact with the. clutch. pawl; member IE1, the tension of the spring 532; is suficiently great to overcome the. added. weight of. the plunger F52.

Reference to 9 will show that. the plunger I12; is held its lower position whenever the finger {63. is free to swing upwardl-y in the ahseiice of a cake. on the conveyor mechanism thereabove. When the plunger islatchedagainst upwardlihoyeinent;thepawl. Idl. i-stowed to move in a. counterclockwise direction against the: ten: sion or the spring, I53, thus. moving out of en-.- gagement with the projection I55 on the cam Hi3 connects the wheel I15. This destroys the connection betweenthe sprocket I41 and the shaft 90, thereby permitting the shaft to rotate freely with respect to' the sprocket. With the partsin this latter condition, the wrapping material severing and feeding means is disabled.

The sprocket Wheel ISI is fixed to a shaft 115, which is mounted for rotation in the frame members 25 and 26. The shaft I15 extends through the frame member 25 Where it enters a housing I'IB (Fig. 1) in which conventional transmission gearing (not shown) is disposed for driving shafts I80, I8I and I82 in the direction indicated by the arrows in Fig. 8. The shafts I82 and I8I have feed rollers I84 and I85 mounted thereon. The feed rollers receive and feed wrapping material M from a roll R, rotatably mounted in the frame members 25 and 26. V

The feed rollers I84 and IE5 are effective to feed the wrapping material M to a fixed cutter plate I9!) (Fig. 8) which extends between and is suitably secured to the frame members 25 and 26. Fixed to the shaft I82 is a blade carrying member I 9| having a cutter blade I32 secured thereto as by screws I93. It will be noted by reference to Fig. 8 that the blade I92 is adapted to pass in cutting relation to the fixed cutter plate I99, and when wrapping material M passes therebetween, it is cut into sheets W heretofore mentioned. The sheets of wrapping material are then received by plates I32 and I33 and are delivered to the conveyor belts I34 and i352 for movement into the wrapping station.

It will be noted by reference to Figs. 2, 8 and 153. that upward movement of the elevating arm I Iii transfers a cake at the wrapping zone into engagement with the lower face of the wrapping sheet, and this continued movement is effective to elevate the cake and superimposed sheet u wardly between a plate I95 and an angle bar I95 (Fig. 2) The angle bar I95 has ears I91. (Fig. 8) at opposite ends thereof, and these cars support a member 209 for oscillating movement. The member 290 is mounted for oscillation in timed relation to the movement of the elevating means so that it moves out of the path of travel of a cake and its associated supporting pallet as the elevating member I I5 transfers the cake upwardly past the same. After passage of the cake, the oscillating member 200 moves into the position shown in Figs. 2 and 12 to engage the lower surface of the supporting pallet D and supports the cake in position for a subsequent operating step.

The plate I95 is mounted for horizontal sliding movement between guide members 2III and 2 (Figs. 1 and 2) and a similar plate 2 I2 is mounted for horizontal slide movement in guide members 2 I and H I, the latter being disposed above and in spaced relation to the plate I95 as seen in Fig. 2. An ejecting block 2I5 is suitably secured to the lower surface of the plate 2 I2 and engages the upper surface of the plate I95 in sliding relation. The plates I95 and 2I2 are adapted to reciprocate simultaneously in opposite directions relative to each other, although it is to be understood that the plate 2I2 has a substantially greater stroke than the plate I95, inasmuch as the plate I95 merely moves out of the path of the cake supporting pallet D as it is raised to the wrapping station, and then moves under one edge of the supporting pallet to afford support to that edge of the cake as the elevating member II moves downwardly as viewed in Fig. 2. On the other hand, the plate 2I2 and its associated ejecting block 2I5 moves from left to right as,

extending shaft 252 (Figs. 4 and 15).

viewed in Fig. 2 for ejecting the cake along with itssupporting pallet from the wrapping station. In its movement out of the wrapping station, the cake and its associated supporting and wrapping material'moves across the upper surface of the angle bar I and also moves along conventional folding bars 2I6 which fold the sheet of wrapping material around the cake in a manner that is Well known in the art and need not be described in specific detail herein.

Reference to Figs. 1 and 2 will disclose that conveyor bars 2I'I extend from the driven conveyor chains 2 I8 and provide a way along which the cakes move through the folding and heat sealing zones of the machine. The conveyor bars 2I'I discharge the wrapped cake package from the wrapping machine after the cake has been wrapped and sealed as generally described hereinabove.

Reciprocating motion is transmitted to the plates I95 and 2 I2 through oscillating crank arms 225 and 226, respectively. This mechanism may best be seen in Fig. 2 of the drawings. The crank arm 225 is mounted on and fixed to a shaft 22'! which is mounted for oscillation in the side frame members II and I2, the shaft 221 having a crank arm 230 (Fig. 10) mounted on one end thereof. One end of a connecting rod 23I is pivoted to the downwardly extending end of the crank arm 239. The opposite end of the connecting rod 23I is connected to a bell crank 292 which is mounted for oscillating movement on a stud 233 extending from the side frame member I2. One of the arms of the bell crank 232 has a substantially vertically extending groove 235 in its surface adjacent the side frame member I2, and this groove is adapted to embrace a cam follower 236 which projects from a cam wheel 231 fixed to the end of the shaft 55.

The crank arm 226 is mounted for oscillation on an idler shaft 240 (Fig. 2). The idler shaft is mounted for rocking movement on the side frame members II and I2. The crank arm 226 has another arm 24I integral therewith, and the free end of the arm has mounted thereon for pivotal movement a connecting rod 242. The other end of the connecting rod 242 is pivoted to one arm of a bell crank 243 which is mounted for oscillation on a bar 244 on the side frame member I2. The opposite arm of the bell crank 243 is adapted to engage a cam wheel 245 fixed for rotation with the transverse shaft 55. The foregoing structure is, therefore, effective to transmit reciprocating motion to the plates 95 and 2I2.

By reference to Fig. 15 it will be seen that one end of the shaft 50 is pivotally connected to the upper end of a yoke arm 25I, the lower end of which is fixed to the forwardly and rearwardly The shaft 252 is mounted for oscillation in bearing blocks 253 and 254 secured by screws 256 to the side frame member II. Keyed to one end of the shaft 252 (Fig. 4) and extending upwardly therefrom is a shipper handle 260.

Figs. 4, 6, '7 and 15 will disclose a brake mechanism which is efiective for halting the movement of the cake conveyor and the wrapping material cutting and feed mechanism upon operation of the stop motion mechanism, in a manner to be described at a later point herein. A block 246 is adjustably secured to the shaft 252 by means of an adjusting screw 246a. The block 246 has a bar 241 secured thereto by screws 24B,

and the block carries a brake shoe 249, the upper surface of which is rconoave. EuitahIe tricti'on brake material 2119a isriveted "to the brake shoe 249. :It will :be noted in Figs. 6 and 7 that the brake lining material 2 49a is adapted to engage the periphery of the :hand wheel 55i for stopping the machine instantaneously upon operation of the .stop mechanism.

It will be observed .by reference dz'oifPigs. 1 and :5 that the shipper .handl'eiififl carries a projection 2B1 intermediate its ends, to this projection is attached one end. of .a sprocket :chain. 251 extends horizontally ior a. :short distance where it. passes over a roller 2 67., the opposite the chain extending downwardly .:and ibeing con: nected to the upper end for a shaft 2261!. The shaft 264 is guided :for sliding movement in a sleeve 365 which is welded to theupnerisu-rfaee of -a ,plate 266., the plate fi'fii-oonstitntinga :part of a "Weight housing and being provided :witha passage for the :shaft'lfid. ilhe weight housing 261 may be seen in Figs. 1., 14, :5 and 14 of :the drawin The plate-r265 i 'welded at oonositeiends thereof to vertically disposed housing dilate-s 2:10 and .2171, the lower ends of which are welded to angle bars 21:2 and 1213, respectively. Thezangle =barsl may be secured to the general supporting surface by means ofscrewsl'li. Extending-between the :vertioal :plate 121110 and 21.! and welded to edges thereof are plates 236, .2.1 .can'd 12758., which to, gether constitute the weight .housi'n'g 2.61.. A clutch and brake operating weight 228:] ,:are mounted for movement in the weight housing 261, the sam'ebe'ing fixedas by threading to the lower 'endzoitheshait 264. l/Vel'dedfto the upper surface of the plate "2-65 of the weight housing 261' and extending upwardly .tlrerefiimn a standard .282, the upper end :of which supports a :Stub shaft 283 on which the roller 22 53 roltatabiy supported.

The sleeve .265, as best :seen inFfig. 1.4,li1as-a slot .284 extending through the avail thereof and the shaft 264 .has .an :annular :gronve therein. The slot 2-85 permits :a slide .memoercziiil "17D rpass therethrough roiengaging a wallnfithe .anru1lar roove-28.6 .in the shaft 2-164. .Therslide member 28:! is mounted for horizontal sliding novement in :gu'ide blocks 2 8.0 securedas -shy welding to the upper surface of the :plate 265.01 the weight housin 2'51.

The outer end of the slide member -28?! cfl lig. 124") is connected toa ourvedspin 351i pro'jeoting from :a metallic :leyer "arm 2-192 mounted .dor: rocking movement aboutpoint $293 on a supporting arm .294. The "supporting :arm :2 9.4 secured shy screws 295 to :a :substantially'au sshaped $153110? magnet core member 22%. :One of theil'egs o'f the U-sshaped core member 2 .915 extends an induction coil 312.0 wound thene'a bout, the .looil being adapted for energization throughnonduce tors 53:03 and 3&2. Theiconductor iiilll KFi'g. if?) extends to a vacuum switch 305 and the-com ductorz3fi2 extends to-a :delayrelay switch 30 6 "The 'vacuum switch 385 comprises a switch housing 130:! having stationary coritae'tsdllfl :and 30.9 therein. The conductor '30:! is electrically connected to the content see. Theeontact film anchors-one end ofsaoonduotorrfi'z which extends therefrom (Figs. 11 :and '157') and shes tits-other end electrically connected to .a vlead conductor 3213. lead conductor-1| 3 includes within its length'ainaster switch 314, andtheendthereof beyond :themaster switohesnxed to ione'terminal of .n-n electrical connector .2315 which is .i'adapted to .be .plugged into :a suitable source or electric energy, hot shown. The other terminal of the male plug 3 I 5 is connected through suitable com duotors with other par-ts of the control mechanism to-be described later. Tleoont rol ciroui-tin cludes a le'a-d wire 31 -1 and it may be -noted by reference to Fig. 1 that the leads ii-l and 32 from the electrio'motor '30 are conneeted to the con;- ductors 3133 and 3H, --respectively. Thus, the electric motor is controlled bythemaster switch ii-i4 and is energized upon "closure of that switch.

The vacuum switch housing 3-0? secured to one end of a bracket 32;] secured loy screws 32"! to the side iramemember I2. The housing "ii-0| of the vacuum switoh has-a plunger 2-2 mounted therein forvertiealslidingmovement, Theupp'er end o-fthe plunger 3 22 projects through the switch housing and extends upwardlythereiroim. The lower end-elf the plunger 3 22 is cormected to a metallic cross arin 323 having atjits ends contact members 324 and'ii'l which are adapted to engage (the fixed -contaot members 508 band 309, respectively. A compression spring 32"! urges the plungeran'd its cross bar 233; upward'ly,-the lower end of the spring bearing against, iout -being insulated from, an inverted cup-shaped member 330 secured as by screwsiiB-l "to the bottom the switch housing-307.

The inverted cup sha p'ed member 3 3 0 isfianged at its peripheral edge and secured as by screws 332 "to the flanged peri heral edge of 1a complementary cup-shaped member The cup-J shaped members are hermetically attached to each other at "their "hanged egos and support therebetween a diaphragm 3%, thereby providing a sealed chamber wherein the diaphragm is sensitive to variations in fluid pressures within the lower diaphragm chamber. The diaphragm "334 is penetrated by a stud "3-36 which extends upwardly and is slidab'ly guidedfor reciprocating movement in the inverted cup-'shapedmember 33E}. The upper end of the stud "336 is welded to an inverted L-shaped switch actuating member 13 37, th mzontal-ly disposed leg of which engages the upper end of the switch plunger 322 which -urged against the horizontal 'leg of the actuator by the oompressionspring 321.

The bottom :of the "cup-shaped memberiffiS is pe etr t by anionic 3 0 w ich is he metically secured thereto as by we d and whi h is d te to ve one .d a fl x ble bei li The ub has remot nd conn ted o a T conduit "31 A other br nch o t e T 09nt 2 s se ured ther to a flexib e u e 3% which i i omin nica ion w th a ni e 545 of a diaphragm 'p im flt, the tails and n ion o ich w be described at a late point. T third leg of the T connection 3132 is in m nimum? cati n with one iendo' a conduit 31 8. he oth end of wh ch communica es i ihe' wcr nd of a threaded tube 351 constituting a Wra ng Sheet sen ing device- T e conn ct on een he s vera nip es and tu es are r e ably adhe i ly aohieved to render thsma t'is'ht- .It ill be mi si e? re erence Fig. 12 t at he upper end of the t ead d tu ha o med at its i T-reendafianss 135.1." hit anuallysas hiakas hew e or be ts 3: so t at she ts o no materi l hei conveyed -=by the .rbelts Hall and its will enga :of the sensing nipple.

and .olose the upper end 35-1., The fsensingmipple-tfii is accommodated byaa passage :in the -1pla'te 1113 3 and provided with :a look nut 35! threaded ithereon toengage the sheets of wrapping material are not positioned with their side edges parallel to the path of travel of the conveyor belts 134 and 135. It will become apparent that the open end of the sensing nipple 351 must be closed by a sheet of wrapping material at specified times in the operating cycle if the operation of the machine is to proceed uninterrupted.

The fluid pressure pump 346 comprises a cast inverted cup-shaped member 355 whose peripheral edge is flanged outwardly to provide a surface at which the same is secured as by screws 356 to the flanged peripheral edge of a cupshaped member 351. The cup-shaped member 351 is penetrated by the nipple 345, the nipple being secured thereto as by welding. The lower cup-shaped member is supported by an angle bracket 360 to which it is secured by a bolt 361. The bracket 361 is secured by bolts 362 to the side frame member i2. The upper cup-shaped member 355 has a horizontal partition 363 through which passes a shaft 364, the lower end of which passes through a diaphragm member 365 hermetically secured at its periphery between the upper and lower cup-shaped members 355 and 351, respectively. The lower end of the shaft 364 is threaded and receives lock nuts 366 and 361 which engage the upper and lower surfaces of the diaphragm member so that movement of the shaft 364 will be transmitted to the diaphragm. The upper end of the shaft 364 (Figs. 16 and 1'1) has an enlarged portion 319 integral therewith. A compression spring 311 is mounted between the lower face of the enlarged portion 310 and the upper surface of the partition 363, thus normally urging the shaft 364 upwardly. The enlarged portion 310 of the shaft 334 is pivoted to one end of a lever arm 312, the lever arm 312 being mounted for rocking movement about a pivot stud 313 supported in the side walls of the inverted cup-shaped member. The inverted cupshaped member 355 has a passage 314 in one side thereof, through which the lever arm 312 extends. The free end of the lever arm 312 has a roller 315 rotatably mounted thereon, the same being adapted to engage the periphery of a cam wheel 311 which may be an integral part of the face cam 321 heretofore described. The cam 3'11 may, on the other hand, be separately provided and fixed for rotation on the shaft 65.

The cam wheel 311 has a peripheral notch 380 into which the cam follower roller 315 is urged by the compression spring 311 when the notch rotates into the zone of the roller. As the compression spring 311 forces the roller 315 downwardly into the cam notch 380, it is manifest that the diaphragm 365will be moved upwardly and, in so doing, will create a negative pressure in the conduit 344. Assuming that a sheet of Wrapping material W is in overlying position with relation to the open end of the sensing nipple 351, the suction thus created in the conduit 344 will create a suction in the conduit 341 and in the lower cup-shaped member 333 of the vacuum switch 305. The diaphragm 334 of the vacuum switch will then be urged downwardly by the greater atmospheric pressure on the upper face thereof, and this in turn will result in downward movement of the stud 336 and the accompanying movement of the contact bar 332 and its associated contacts 324' and 325 out of engagement with the contact members 308 and 309, thus opening the circuit through the vacuum switch 305. Conversely, therefore, when no wrapping material overlies the open end of the sensing nipple 351, the negative pressure created in the conduit 334 will draw air through the sensing nipple and the connecting pipe 350, thus leaving unaffected the diaphragm 334 in the vacuum switch 305. Under these conditions the circuit through the vacuum switch 305 will remain closed.

The conductor 302 which extends from the magnetic coil 300 associated with the weight release mechanism shown in Fig. 14 extends to the time delay relay 306. There are several types of time delay relays which may be used for the purpose of the control system herein, and the specific mechanism disclosed in Fig. 13 of the drawing may therefore be considered as representative of a number of conventional devices that are available. The relay 306 is supported by a base plate 382 secured by screws 383 to the frame member 26. A block 385 is suitably secured to the plate 382 and has a solenoid coil 386 suitably secured thereto. The solenoid 386 has associated therewith a core 381 mounted for vertical sliding movement therein. The free end of the core is connected as at 390 to a slidable member 391 mounted for vertical sliding movement in a guide frame 392 which is integral with the block 385. The slide member 391 carries a Z-shaped operating plate 393 to which one end of a tension spring 394 is connected. The other end of the tension spring 394 is connected to a diaphragm valve housing 395 which likewise is secured to a supporting plate 382. It may be understood, therefore, that the tension spring 394 normally urges the slide member 391 upwardly, as best seen in Fig. 13. The vacuum valve housing 395 has a pin 396 projecting downwardly therefrom for guiding the reciprocation of a block of insulating material 391. The block 391 is urged against the Z-shaped plate 393 by a compression spring 400 which bears against the lower surface of the diaphragm valve housing 395. The block 391 has pivoted thereto one end of a lever arm 401 which is mounted for rocking movement intermediate its ends about an ear 403 which projects from the valve housing 395. A switch housing 405 is secured to the ear 403 and its upper wall has a passage therethrough which serves as a guide for a sliding switch plunger 406. The free end of the switch plunger 406 engages an adjusting screw 401 threaded in the lever arm 401. The plunger 406 is of insulating material and supports at its lower end a leaf spring contact bar 410 which has contact members 41 1 and 412 secured at opposite ends thereof.

As schematically shown in Fig. 17, the switch housing 435 has therein fixed contact members 413 and 414 which are adapted to be engaged by the movable contact members 411 and 412, respectively. A suitable compression spring 415 engages the lower surface of the leaf spring contact bar 410 and bears against the lower wall of the housing 405, thereby urging the leaf spring contact bar 410 and its associated plunger 406 upwardly. The lead 302 from the solenoid 300 extends to and is connected with the contact member 413. The contact member 414 has a conductor 420 extending therefrom, the other end of .13 which is electrically connected to a leaf spring contact bar 42! disposed-within a switch housing 422-, to be described more specifically hereinafter.

Housing 395 of the relay delay mechanism 366 has a cavity 424 therein which is spanned by a diaphragm 425 to the center of which one end of an L-shaped member 426 is suitably connected. One leg of the L -shaped member 426 extends downwardly through the lower wall of the housing 3525 and is secured at its lower end to the insulating block 391. The diaphragm member 425 is secured to the upper edge of the housing 395 by a block member 421 having a cavity 43!) therein, the block member 421 being secured to the housing 395 by screws 432.

The block member 421 has a suitable needle valve mechanism 433 which is adjustable to permit passage of air into the chamber 430, there being a suitable exhaust valve mechanism 435 mounted in the upper wall of the block 421 through which the air in the chamber 430 may escape when the tension spring 394 urges upwardly the Z-shaped plate 393, its associated block 39?, the L-shaped member 426, and the diaphragm 425. It is to be understood that the tension spring 394 is substantially stronger than the compression spring 439 so that the compression spring offers negligible resistance to the tension spring as it moves the associated parts upwardly as hereinabove described,

The solenoid coil 386 is energized through conductors 446 and 4.4!, the conductor 44] being connected to a conductor 442, one end of which is connected to the lead conductor 3H and the a other end of which is connected to a fixed contact bar 444 which is a part of the switch mechanism 4 22 hereinbefcre mentioned. It may be observed, particularly with reference to Fig. 3, that the switch 422 is secured as by screws 445. to a bracket 441, the lower end of which is secured as by screws 448 to a conventional chain guard 452 extending over the sprocket chain 160 and the sprocket wheel 16!, and being suitably secured to the frame member 26.

The switch 422 has a plunger 453 mounted for horizontal sliding movement therein, the inner end of the plunger engaging a leaf spring contact member 42 I. The plunger 453 is of insulating material, and, its outer end engages an operating lever 454. The upper end of the lever 454. is pivoted on a stud 45.5... and the lower free nd thereof rotatably mounts. a cam following roller 45?. The roller 451 is, adapted to engage the periphery of a cam wheel 46.0 having a lobe or projection 46] thereon. The cam wheel is fixed for rotation on one end'of the shaft I82 onwhich the web blade carrying member [9! is mounted. The function of the switch 422 andthe cam wheel 4% will be described at a later point.

By reference to Fig. 17 it may be observed that the conductor 44% from the-other side of the solenoid coil 33% is connected; at its other end to a leaf spring contact member 465 disposed within a switch housing 466. The switch housing 4% (Figs. 1, 3 and 17) is secured by screws-458 to a bracket 4%, the lower end ofwhich issecuredas by screws 4H to the chain guard 452. The switch 466 hastherein a fixedcontact bar 461 to which one end of a conductor 41!!- isconnected,

the other end of theconductor being connectedto the conductor 342 extending from the vacuum switch 365 to the lead wire 3l3. The switch 466 issimilar in construction tothe switch 442 heretofore described, anditembodies a plunger-412 of;

insulating materialwhich is normallyurged outwardly by the leaf lett ng contact member 465.

The outer end of the plunger 412 en ages an The cam wheel 415 has a raised portion or lobe 411 integral therewith which isadapted to intermittently open the switch 466 as will be more readily understood from a reading of the following circuit description.

Assuming the machine to be inrepose and the web of wrapping material to extend fromthe r011 R (Fig. 3) tothe feed rollers I84 and IE5, and assuming also that no cakes have been deposited on the feed conveyor bars :53 and 94, the control system will be as shown in Fig. l7 of the drawings. Herein the line switch 314. is open, the motor 3!) is deenergized, the switch 466 is normally closed and the switch 422 i normally open. The electromagnet 385 is deenergized with the result that contacts 4'16, 4H, 412 and 413 are separated. The pneumatically operated switch 365 is closed and the clutch control electromagnet 300 is deenergized.

The position of the switches. 422 and 46.6 is controlled by the lobes 461 and 411' of the. cams carried by the cam shaft I82, and it isobaracteristic that the cam shaft I82 always stops in the position substantially as indicated in, Fig. 17 and remains in that position when the machine is inactive. It follows, therefore, that the circuit is as described hereinabove when the machine is at rest.

Upon closure of the switch 314,, a circuit is established from the power line through. the, con.- ductor 3!, the motor 30. and the return conductor 32. Thev motor is thereby energized with the result that power is transmitted through the pulley 35, the belt 38 and to the pulley 3.1 (Fig. 15) which, however, atv this. point, rotates freely on the shaft 49 for the reason, that. the dog clutch member 42 has not yet, been en aged in driving relation. Upon closing the line switch 3| 4 a circuit is also establishedv to energize thev electromagnet, 386,, which is. in control of. the time delay switch 495', this circuit being through conductors 3H; 442 and 441 to the el'ectroma net 386 and thence through conductor 440. to. one side of the normally closed; switch. 466', through conductor 41!) and to the opposite side of the line. When the electromagnet 3136 is energized the Z-shaped control bar 383 is withdrawn, from 1 supporting contact under the insulating block.39'1.

with the result that the spring 4100 will become. operative to open the contact points of the switch, 405 under the control of the time delay device 306. It will, be observed therefore that the contact points of switch 405; are normally open until electromagnet 38B is deenergized, thereby permitting the tension spring 394; to act on the switch operating mechanism for closing the circuit thereat. This condition prevails upon open.- ing of the contact points of switch. 466'.

The shipper handle 260 is moved" in a clockwise direction as viewed in Fig. 5 to raise the weight member 281- to the position shownin this figure, the weight normally being in a lowered position while the machine is inoperative. The tension spring 2% in Fig. 14" urgesthe slidememher 281' from left to right against the shaft-284f when the weight 28! is in a lowered position, and consequently,- when the weightmember 28f is raised, the tension spring 290 will urge the slide the lever arm 292 out of engagement with the core 296 of the electromagnet 309, as shown in Fig. 14.

The sequence of movements just described will also result in movemnt of the brake shoe 294a from the position shown in Fig. '7 to the position shown in Fig. 6, thereby releasing its engagement with the hand wheel 51. As the shipper shaft 50 is moved from left to right in Fig. 15, the dog clutch member 43 is moved into engagement with the dog clutch member 42, thus transmitting power through the pulley 31 to the shaft 40 for rotation of the shaft in a clockwise direction as viewed in Figs. 2 and 4, or in a counterclockwise direction as viewed in Fig. 10. Rotation will then be transmitted to the shaft 55 through the pinion 53 on the shaft 40 and the gear 54 on the shaft 55 (Fig. 2), which in turn will trans mit rotation to the forwardly and rearwardly extending shaft 69 (Fig. through the miter gears 56 and 51, thus rotating the shaft 60 in a clockwise direction as viewed in Fig. 3. The shaft 60 transmits rotary'motion to the shaft 55 through the miter gears 52 and 63.

By reference to Fig. 2 it will benoted that the sprocket wheel 66, mounted on the shaft 85 will transmit rotary motion to the shaft 1 I, through the sprocket chain 61 and the sprocket wheel 19, thereby driving the conveyor chains 13-16, inclusive, as well as the chains I91.

It will be remembered that no cakes have yet been deposited on the conveyor bars 93 and 94, and therefore the cake sensing finger I63 is in its elevated position, and so long as this position is maintained the clutch finger I5I will remain out of engagement with the clutch tooth I53 through which motion is transmitted to the shaft 80. Consequently, the paper severing and delivering mechanism is inactive even though the cake conveying mechanism and the elevator mechanism is in operation. Assuming, therefore, that it is desired to wrap cakes in normal process, the cakes on their supporting pallets D will be deposited on the conveyor bars 93 and 94, and such cakes will be moved from the loading end of the conveyor toward the wrapping zone as operation of the machine continues. As soon as a cake approaches the wrapping station, it will depress the cake sensing finger I53, thereby rocking its associated link about the pivot point I63a and thereby imparting such longitudinal movement to the operating rod I65 which will effectively Withdraw the latch segment I66 from contact with the pin shoulder I1 I. When the pin I12 is rendered free to rise and fall with the normal rotation of the clutch pawl I5I as it rotates, the pawl actuating spring I53 will draw the tooth of the pawl into contact with the clutch tooth I55, thereby transmitting a rotary motion to the sprocket gear I41, in contact with which is disposed the sprocket chain I60. Rotary motion is thereby transmitted to the shaft I15 and through the intermediate gears (not shown) to the paper cutting and delivery mechanism.

It follows from the foregoing, therefore, that upon closure of the line switch 3I4 and consequent energization of the motor 30, the conveyor mechanism and the cake elevating mechanism is rendered fully operative to perform its intended function.- However, the paper cutting and delivery mechanism remains idle and will not come into operation until the power transmitting mechanism betweenthe shaft 99 and the paper cutting and delivery mechanism is rendered operative by contact between the cake sensing finger I63 and a cake overriding its position. As soon as the paper cutting and delivery mechanism has been rendered operative, wrapping sheets will be severed from the supply web and delivered to the wrapping station under guidance of the conveyor belts 135. As heretofore described, the paper sensing nozzle 352 is located in proximity to the wrapping station and within the line of movement of a severed wrapping sheet that is being properly fed into the wrapping station. The control system illustrated in Fig. l? of the drawings is particularly designed for control under the influence of a wrapping sheet at the wrapping station. Consequently the sheet sensing nozzle 352 is the principal control instrumentality for the control system as will appear from a consideration of the further operation of the system.

So long as cakes are fed in normal sequence to the wrapping station, the cake sensing finger I63 will remain depressed and consequently the sheet severing and delivery mechanism will remain in operation. Upon arrival of a wrapping sheet at the wrapping station, a sheet sensing cycle is initiated, and so long as sheets are regularly presented in proper position at the wrapping station, normal operation of the machine continues. Thus, provision has been made for impressing an electrical sensing impulse on the control system in timed relation to the arrival of a wrapping sheet at the wrapping station. It will be remembered that the control instrumentalities are as described hereinabove, i. e. the switch 422 is normally open, the switch 256 is normally closed and the switch 395 is also normally closed. The closed condition of the switch 456 is effective to energize the electromagnet 385, thereby permitting the contact points of switch M5 to open. With the control system conditioned in this manner, the clutch and brake control electromagnet 399 remains deenerg'med. However, upon the approach of a Wrapping sheet at the wrapping station, the raised portion 411 of the cam 416 rides into contact with the cam follower 415 and depresses the same. As the cam follower lever 413 is swung in a counterclockwise direction about its pivot 414, the switch operating pin 412 is pressed inwardly, thereby separating the points of the switch and breaking the circuit that normally energizes the electromagnet 386. When the electromagnet 386 is deenergized, the spring 394 will move the switch operating block 391 upwardly into the delay return mechanism 306, thereby depressing the switch operating bar 401 and closing the contacts 4, M2, M3 and M4. This conditions the switch 495 for the transmission of an energizing impulse to the electromagnet 330 upon closure of the switch 422 in the event no wrapping sheet is present at the wrapping station. Herein, however, it is assumed that wrapping sheets are being presented at the wrapping station in normal sequence, and so long as a wrapping sheet is in a position overlying nozzle 352, the switch mechanism 305 is disabled, thereby breaking the circuit to the main clutch and brake control electromagnet 396. This sequence of events follows from the following features of the control system.

The peripheral notch 389 of the cam disc 311 is effective to actuate the fluid pressure pump 346 Once during each wrapping cycle. The pump 34G operates herein as a suction pump when the cam follower: 1-315 Iithereof adropssintov theacanr notchi 380;: When. ithfi .diaphragmti 655 of: ithe pump is elevated by movement. of: the operating. arm 315 :abouttits pivot 31:3, :a negative "pressure is impressed on "the pneumatic. systemzextending between the pump and ctheiluid pressure switch 305. So long as a wrappingsheet-overlies the nozzle "352 at the :wrapping station, the negative pressure will influence the diaphragm 334 of the switch305 and pull the same .downwardlyfithere-v by opening the contacts 308,309,324 and325 cfthe switch structure.- It will berecalled thatthe switch 305 .isflin the circuit .of .thetclutoh and brake control magnet 300i,'and .consequentlyii this switch'is' open, no energizing,currentwill. reach the magnet 300' and consequentlyrnachine operation will proceed in normal course.

The instrumentalityfor impressing the sensing impulses 'onthe circuit of the magnet see is the lobe 46! 'of the cam which influences the. switch 422. The lobe '4'6l is" so designed and positioned as to render effective operationoi'the switch 42". immediately after the pneumatic impulse has been generated by the droppingof the cam fol lower 315 'intothe peripheral camslot 300;- Whenthe-lobe 46 lrides-in contact with the cam follower 451 the follower lever 454 is rotated'in a clockwise direction about its pivot" point 455, thereby pressing the switch operatirig rod 453- inwardly. and :closing :the :contact N4 of. the switch 422. When fiihiSitCOllditiOIl is achieved, an energizing impulse 20f momentary duration is 1 .-im-'. pressed ;upon-theacirc11it'.in which :thebrake and clutchxmagnet 1300 Lis -disposed. Thisrcircuit is byswam-oi the conductors =3 H, 402 :into the :now; closed switch. point M4, through "the aconductor 420 into the :now closed switch 5405,:- through the. conductors 302 :into the electromagnet-$11110 ;andn from-there-throug-h the conductor -30l' into the switch 305. As hereinbefore related, however; if. a sheet of wrapping material is positioned .over the :sheet sensinglnozzle 352 the negativepneu-e matic .-impulse generated byfthe fiuidmpressure pump 340 will L permit.- depression of. 1 the dias. phragm 34d of the pneumatic switch 305,:=ther.e-- by separatingits contact points. When this-cone dition; prevails the circuit in which: the :.electro-' magnet 300 wis-disposed will bewincompletesand the magnet-will therefore be not-energized:

Let it be assumed now that a wr ppingisheethas :failed for anyone of several reasonsto-arrive in. vproperposition at the wrapping-station,- the .nozzle 352 will therefore 'be -open:- to.:the. at.-, mosphere, :and when the fluid pressure pump 346 is :operated bytthe'presence of the cam slot :380, air will be drawn through the open. nozzle352 andwthe pneumatic impulse device swillultherefore have no effect on the pneumatic switch 305.: Inzthis -event;:the contacts 3085300, 324 and 325 of the npeumatic switch 1305 :will .remainiiclosedz under :the. influence :of the spring 321.. With the contacts closed, aszdescribed, the .impulseithat has been-impressed on the :controLsystemshy2010+v sure :of the now; closed sensing. zswitchijniswilll. be-:through the electromagnet 300-as .'.herein;-. before .-described;. but :the circuit will. :continuethrough the closed rcontacts -:of.- the pneumatic switchi305to the .opposite'sideof th'eline,through conductors 2312;. .31 3 :tlirough; closedtiline 7 switch: 3| 4. In' this event-, the= electromagnet 300- wi ll be energized; Lthereby :rdrawin'g, its armature 292 intocontact with: the magnet core- 296; Movementcof ithe armature 29-2 about its pivot point 293,;willxwithdraw the latch plate 81 from its control; position-within the-grooved on the race of; the rod 164w Upon: the achievement.- OinthiS;

v viewed in Fig; "15, thereby separating the com-s.

plementary :clutchi members 42 iand llfl, which? separation effectively disconnects the. wrapping machine mechanism from its power source. At-

the :same time, oscillation of theshaft 252 in its bearing brackets 254will =be effective to' rockthe brake member-249 'in a counterclockwise-di-- rection to bring the :brake shoe 249a into contact' with-#the hand wheel This "contact will beeiiective -'-to Lbring--*the entire mechanism to-=aprompt halt;

It will 'be recalled that :onemf the objeots of: the inventionis to provide-means -whereby the cake elevatingmechanism may "continue- -to-op-- crate *for a predetermined'length 'oftime --'for elevating the cake to a *pos'ition abovethe-point at which it normally-engages the wrapping mate'rial and 'to thereby position the "cake whereit will be accessible for removal after the-machine has been stopped in case there 'has been "a failure inwrapping sheet-delivery." Toithe end that this -objectiveis implemented; there has been established a relation'between-the'cam'1 21 from which the cake *elevating arm1l5is' operated' and the 'lobe ll'il' oi-the cam whichoperates the switch 122.' These --cam's are so designed-and mountedthat the cake transfer mechanism; ineluding-the elevator ar1n*=|l5,---will approach its ultimate transfer positionat the wrappingstation' before the lobe 46f of "the switchi'actuating cam' comes into contactwith 'the cam follower -45! to thereby impress a sensing impulse on the circuit which includes the electromagnetic -device 300 and the-pneumatic switch 305: Iii-follows;

therefore; that if -a='cake -*is present -unde'r--the wrapping station,-even-though no wrappingsheetis present *therein, the transfe'nmeehanism will continue to operate and the-elevating arm I I 5 will elevate=the cake to nearlyit's" ultimate .posi

tion in the 'wrapping station before the switch" 42? is: clo'secl to-=energize= the *electromagnet cir-"' cuit. As a: consequence, the elctromagnet--=300 will 'come intotoperation ifno sheet of wrapping material "is presentover the --=sensing nozzle 35land disable the-powentra-nsmission devicebe-' tween the -so.urce of power and the drive shaft of the wrapping-machine-as the transfer arm I I5 approaches its ultimate position. Prompt stop page of the machine, of course, follows because" of the provision of-the brake device-operative on the-handwheel 5 i.

It will follow from the foregoing, therefore," that there --has been provided herein a wrapping machine control-mechanism which is effective to control sheet cuttingand delivery-mechanism under theinfiuence of normal feed of -'ca=kes-by aconveycr mechanism intoa wrapping station." Particularly, it is to beobserved-that the sheetsevering and delivery mechanism-is-'energizedonly when a cakeis-moved-intothe wrapping station. This function r is effective to avoid the delivery 'of wrapping sheets into the "wrapping" station 'when no cakes are present; Clo'ggage in the wrapping station I by wrapping --sheets' and 191 consequent waste of such sheets is thereby avoided. Furthermore, it is apparent from the foregoing that there has been provided herein a control system for wrapping machines, wherein provision is made to avoid the delivery of a cake into the wrapping station at such times that wrapping sheets are absent or improperly posi-.

tioned at such station to receive the cake to be wrapped. This function effectively avoids the passage of cakes into the folding and sealing stations of the machine when no wrapping sheet is present at the wrapping station, and consequently avoids the passage of unwrapped cakes into subsequent stages of the packaging operation.

The control system forming the substance of the invention has been shown as applied to a particular wrapping machine of conventional structure, and it has been made clear hereinbefore that this particular wrapping machine has been selected merely for the purpose of illustration and that the control system may be applied to any wrapping machine of its general type or other machines of similar structure. Furthermore, the control system has been disclosed in a single embodiment and it is manifest, however, that changes may be made in this system within the skill of one in the art without departing from the spirit of the invention as defined in the following claims.

What is claimedis: V

1. In a wrapping machine having a conveyor for transporting articles to a wrapping station, a drive means for said conveyor, means for delivering separate sheets of wrapping material to the wrapping station in timed relation to the transfer of articles to the wrapping station, and a source of power; a stop motion system comprising a, power transmission clutch between the drive mechanism and the power source, an electromagnet device for controlling said clutch, a normally closed pneumatic switch, a normally open circuit connecting said electromagnetic device and said switch with a power source, an air pump for impressing pressure changes on said switch, wrapping sheet sensing means in the path of a wrapping sheet as it is being delivered to said wrapping station responsive to such sheet for rendering effective the influence or said air pump to open said switch, means operative concurrent with the delivery of an article to said wrapping station by said conveyor for impressing a momentary electrical impulse on said circuit following operation of said pump, and means operative during the operation of said pump for closing said normall open circuit.

2. In a wrapping machine having a conveyor for transporting articles to a wrapping station, a drive means for said conveyor, means for delivering separate sheets of Wrapping material to the wrapping station in timed relation to the transfer of articles to the wrapping station, and a source of power; a stop motion system comprising a power transmission clutch between the drive mechanism and the power source, an electromagnetic device for controlling said clutch, a pneumatic switch, a normally open circuit connecting said electromagnetic device and said switch with a power source, an air pump for impressing pressure changes on said switch, wrapping sheet sensing means in the path of a wrapping sheet as it is being delivered to said wrapping station responsive to such sheet for venting said pump to the atmosphere in the absence of a sheet effective to close said switch, means cle to said wrapping station by said conveyor for impressing a momentary electrical impulse on' said circuit following operation of said pump, and means operative during the operation of said pump for closing said normally open circuit.

3. In a wrapping machine having a conveyor for transporting articles to a wrapping station, a drive means for said conveyor, means for delivering separate sheets of wrapping material to the wrapping station in timed relation to the transfer of articles to the wrapping station, and a source of power; a stop motion system comprising a power transmission clutch between the drive mechanism and the power source, an electromagnetic device for controlling said clutch, a normally closed pneumatic switch, a normally open circuit connecting said electromagnetic device and said switch with a power source, an air pump for impressing pressure changes on said switch, wrapping sheet sensing means in the path of a wrapping sheet as it is being delivered to said wrapping station responsive to such sheet for rendering eifective the influence of said air pump to open said switch, a rotary cam operative concurrent with the delivery of an article to said wrapping station by said conveyor for impressing a momentary electrical impulse on said circuit following operation of said pump, and a second rotary cam operative during the operation of said pump for closing said normally open circuit.

4. In a wrapping machine having a conveyor for transporting articles to a wrapping station, a drive means for said conveyor, means for deliverying separate sheets of wrapping material to the wrapping station in timed relation to the transfer of articles to the wrapping station, and a source of power; a stop motion system comprising a power transmission clutch between the drive mechanism and the power source, an elec-' tromagnetic device for controlling said clutch, a pneumatic switch, a normally open circuit connecting said electromagnetic device and said switch with a power source, an air pump for impressing pressure changes on said switch, wrapping sheet sensing means in the path of a wrapping sheet as it is being delivered to said wrapping station, responsive to such sheet for venting said pump to the atmosphere in the absence of a sheet effective to close said switch, a rotary cam operative concurrent with the delivery of an article to said wrapping station by said conveyor for impressing a momentary electrical impulse on said circuit following operation of saidpump, and a second rotary cam operative during the operation of said pump for closing said normally open circuit.

5. In a wrapping machine having a conveyor for transporting articles to a wrapping station, a drive means for said conveyor, means for delivering separate sheets of wrapping material to the wrapping station in timed relation to the transfer of articles to the wrapping station, and a source of power; a stop motion system comprising a power transmission clutch between the drive mechanism and. the power source, an electromagnetic device for controlling said clutch, a normally closed fluid pressure switch in the circuit of said electromagnetic device, a fluid pressure pump, a conduit connecting said pump and said switch, a cam mechanism for intermittently operating said pump for exhausting said conduit thereby opening said switch, means including a normally open circuit for impressing a momentary electrical impulse on the circuit including said switch and said electromagnetic device following operation of said piunp, a cam operative concurrent with the delivery of an article to said wrapping station to render said impulse impressing means operative, a vent for said conduit in the path of a wrapping sheet as it is being delivered to said wrapping station, whereby in the absence of a sheet over said vent the fluid pressure switch will remain closed to permit operating current to energize said electromagnetic device, and means operative during the operation of said pump for closing said normally open circuit.

J OCH! (3'. BAREFOOT.

References Cited in the file of this patent Number Number UNITED STATES PATENTS Name Date Agnew Feb. 10, 1903 Reifsnyder June 11, 1918 Brownell May 16, 1922 Mertis June 26, 1934 Hodgson Oct. 29, 1935 Harrison Nov.'21, 1939 Sandberg July 23, 1940 FOREIGN PATENTS Country Date Austria of 1913 Great Britain of 1930 Great Britain of 1947 

